Deciduous teeth are baby teeth. We're born with two full sets of teeth and this first set is also called primary, milk or lacteal dentition. These teeth begin to erupt anytime after 6 months of age, which is commonly referred to as "teething." Teeth normally erupt in pairs and the first that normally come in are the lower central incisors. By the time your child is 2, he or she should have a full set of deciduous teeth.
Why Two Sets?
As an infant, our mouths are too small for a full set of permanent teeth, so we require deciduous teeth until our jaw is able to sustain the permanent set. Baby teeth are essential in the alignment, spacing and occlusion of primary teeth. They prepare the adult jaw for their permanent fellows.
As the adult teeth (seccedaneous teeth) form, special cells called odontoclasts absorb the roots of the baby teeth, so that when your adult teeth start to emerge from your gums the deciduous teeth have no roots, making them loose and able to easily fall out.
Caring for Deciduous Teeth
A gross misconception about baby teeth is that since they will eventually be replaced by primary teeth, there's no reason to take care of them. But cavities are a very real cause for concern -- even for deciduous teeth. Children who suffer from dental cavities in their baby teeth are more prone to cavities in their permanent teeth. And every dentist will agree that oral hygiene habits begin in childhood. So it is essential that you take excellent dental care of your little ones' baby teeth, as they won't be able to do so themselves for the first handful of years.
Good oral hygiene begins at teething. Simply rubbing your infant's gums with a wet washcloth will begin to develop habits that he or she will require for life. Once the first teeth erupt, begin brushing them twice a day. Once more teeth fill in, you can begin flossing, too. And be sure to set up your child's first dental visit when the first tooth appears or by age 1.